.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": 8,
    "sourceType": "module"
  },
  "env": {
    "es6": true,
    "node": true,
    "browser": true
  },
  "globals": {
    "atom": true
  },
  "extends": "eslint:recommended",
  "rules": {
    "for-direction": ["warn"],
    "getter-return": ["error"],
    "no-cond-assign": ["warn", "always"],
    "no-control-regex": ["off"],
    "no-template-curly-in-string": ["warn"],
    "no-unsafe-negation": ["error"],
    "valid-jsdoc": ["warn", {
      "requireParamDescription": false,
      "requireReturnDescription": false }],

    "array-callback-return": ["error"],
    "consistent-return": ["error"],
    "curly": ["error"],
    "default-case": ["error"],
    "dot-location": ["error", "property"],
    "eqeqeq": ["error"],
    "no-alert": ["error"],
    "no-caller": ["error"],
    "no-eval": ["error"],
    "no-extend-native": ["error"],
    "no-extra-bind": ["error"],
    "no-extra-label": ["error"],
    "no-floating-decimal": ["error"],
    "no-implicit-coercion": ["error", {
      "allow": ["!!"] }],
    "no-implicit-globals": ["error"],
    "no-implied-eval": ["error"],
    "no-invalid-this": ["warn"],
    "no-iterator": ["error"],
    "no-lone-blocks": ["error"],
    "no-loop-func": ["error"],
    "no-multi-str": ["error"],
    "no-new": ["error"],
    "no-param-reassign": ["error"],
    "no-proto": ["error"],
    "no-return-assign": ["error"],
    "no-return-await": ["error"],
    "no-self-compare": ["error"],
    "no-sequences": ["error"],
    "no-throw-literal": ["warn"],
    "no-unmodified-loop-condition": ["error"],
    "no-unused-expressions": ["error"],
    "no-useless-call": ["error"],
    "no-useless-concat": ["error"],
    "no-useless-return": ["error"],
    "no-void": ["error"],
    "no-warning-comments": ["warn"],
    "no-with": ["error"],
    "require-await": ["warn"],
    "wrap-iife": ["error"],

    "strict": ["error"],

    "no-label-var": ["error"],
    "no-shadow-restricted-names": ["error"],
    "no-unused-vars": ["error", {
      "args": "none" }],
    "no-use-before-define": ["error", {
      "functions": false,
      "classes": false }],

    "array-bracket-spacing": ["error", "never"],
    "block-spacing": ["error", "always"],
    "brace-style": ["error", "stroustrup", {
      "allowSingleLine": true }],
    "camelcase": ["error", {
      "properties": "never" }],
    "comma-dangle": ["error", "only-multiline"],
    "comma-spacing": ["error", {
      "before": false,
      "after": true }],
    "comma-style": ["error", "last"],
    "computed-property-spacing": ["error", "never"],
    "eol-last": ["error"],
    "func-call-spacing": ["error", "never"],
    "func-name-matching": ["error"],
    "func-style": ["error", "declaration", {
      "allowArrowFunctions": true }],
    "indent": ["error", 2, {
      "VariableDeclarator": {
        "var": 2,
        "let": 2,
        "const": 3 },
      "ignoredNodes": ["ConditionalExpression"] }],
    "jsx-quotes": ["error", "prefer-double"],
    "key-spacing": ["error", {
      "beforeColon": false,
      "afterColon": true,
      "align": "colon" }],
    "keyword-spacing": ["error", {
      "before": true,
      "after": true }],
    "linebreak-style": ["error", "unix"],
    "lines-between-class-members": ["error", "always", {
      "exceptAfterSingleLine": true }],
    "max-len": ["error", {
      "code": 100,
      "ignoreComments": true,
      "ignoreStrings": true,
      "ignoreTemplateLiterals": true,
      "ignoreRegExpLiterals": true }],
    "new-cap": ["error"],
    "new-parens": ["error"],
    "no-array-constructor": ["error"],
    "no-multi-assign": ["error"],
    "no-multiple-empty-lines": ["error", {
      "max": 2,
      "maxBOF": 0,
      "maxEOF": 0 }],
    "no-new-object": ["error"],
    "no-plusplus": ["error", {
      "allowForLoopAfterthoughts": true }],
    "no-tabs": ["error"],
    "no-trailing-spaces": ["error"],
    "no-unneeded-ternary": ["error"],
    "no-whitespace-before-property": ["error"],
    "object-curly-spacing": ["error", "always"],
    "operator-linebreak": ["error", "before", {
      "overrides": {
        "=": "after",
        "+=": "after",
        "-=": "after",
        "*=": "after",
        "/=": "after",
        "%=": "after",
        "**=": "after",
        "<<=": "after",
        ">>=": "after",
        ">>>=": "after",
        "&=": "after",
        "^=": "after",
        "|=": "after" } }],
    "padded-blocks": ["error", "never"],
    "quote-props": ["error", "consistent-as-needed"],
    "quotes": ["error", "double"],
    "semi": ["error", "always"],
    "semi-spacing": ["error", {
      "before": false,
      "after": true }],
    "semi-style": ["error", "last"],
    "space-before-blocks": ["error", "always"],
    "space-before-function-paren": ["error", {
      "anonymous": "always",
      "named": "never" }],
    "space-in-parens": ["error", "never"],
    "space-infix-ops": ["error"],
    "space-unary-ops": ["error", {
      "words": true,
      "nonwords": false }],
    "spaced-comment": ["error", "always"],
    "switch-colon-spacing": ["error", {
      "before": false,
      "after": true }],
    "template-tag-spacing": ["error", "never"],
    "unicode-bom": ["error", "never"],

    "arrow-body-style": ["error", "as-needed"],
    "arrow-parens": ["error", "as-needed"],
    "arrow-spacing": ["error", {
      "before": true,
      "after": true }],
    "generator-star-spacing": ["error", {
      "before": false,
      "after": true,
      "method": {
        "before": true,
        "after": false } }],
    "no-duplicate-imports": ["error"],
    "no-useless-computed-key": ["error"],
    "no-var": ["error"],
    "prefer-arrow-callback": ["error"],
    "prefer-const": ["error"],
    "prefer-numeric-literals": ["error"],
    "prefer-rest-params": ["error"],
    "prefer-spread": ["error"],
    "require-yield": ["warn"],
    "rest-spread-spacing": ["error", "never"],
    "yield-star-spacing": ["error", {
      "before": false,
      "after": true }]
  }
}